CN115302222A - Axial displacement installation and debugging method - Google Patents
Axial displacement installation and debugging method Download PDFInfo
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- CN115302222A CN115302222A CN202211137003.0A CN202211137003A CN115302222A CN 115302222 A CN115302222 A CN 115302222A CN 202211137003 A CN202211137003 A CN 202211137003A CN 115302222 A CN115302222 A CN 115302222A
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- 238000006073 displacement reaction Methods 0.000 title claims abstract description 93
- 238000000034 method Methods 0.000 title claims abstract description 55
- 238000009434 installation Methods 0.000 title claims abstract description 35
- 239000000523 sample Substances 0.000 claims abstract description 44
- 238000004513 sizing Methods 0.000 claims description 6
- 239000000565 sealant Substances 0.000 claims description 4
- 230000001105 regulatory effect Effects 0.000 claims 1
- 238000011900 installation process Methods 0.000 description 11
- 239000002585 base Substances 0.000 description 7
- 238000012544 monitoring process Methods 0.000 description 4
- 238000010586 diagram Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 238000007789 sealing Methods 0.000 description 2
- 239000003637 basic solution Substances 0.000 description 1
- 230000001419 dependent effect Effects 0.000 description 1
- 238000012806 monitoring device Methods 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 238000010977 unit operation Methods 0.000 description 1
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23P—METAL-WORKING NOT OTHERWISE PROVIDED FOR; COMBINED OPERATIONS; UNIVERSAL MACHINE TOOLS
- B23P19/00—Machines for simply fitting together or separating metal parts or objects, or metal and non-metal parts, whether or not involving some deformation; Tools or devices therefor so far as not provided for in other classes
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23P—METAL-WORKING NOT OTHERWISE PROVIDED FOR; COMBINED OPERATIONS; UNIVERSAL MACHINE TOOLS
- B23P19/00—Machines for simply fitting together or separating metal parts or objects, or metal and non-metal parts, whether or not involving some deformation; Tools or devices therefor so far as not provided for in other classes
- B23P19/04—Machines for simply fitting together or separating metal parts or objects, or metal and non-metal parts, whether or not involving some deformation; Tools or devices therefor so far as not provided for in other classes for assembling or disassembling parts
- B23P19/06—Screw or nut setting or loosening machines
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Abstract
The invention relates to the technical field of steam turbine installation, and particularly discloses an axial displacement installation and debugging method, which comprises the following steps: s1: installing an axial displacement probe inside a front box of the steam turbine; s2: installing an upper cover of a front box of the steam turbine, and S3: in the process of installing the upper cover, debugging the installation of each connecting bolt when the upper cover is installed through the axial displacement probe; s4: installing a side cover of a front box of the steam turbine by using a fixing bolt through a connecting block; s5: the invention aims to solve the problems that the axial displacement deviation can be caused in the process of installing an upper cover and a side cover of a traditional turbine front box, the protection misoperation or the action rejection can be caused in the operation process of a unit to cause the unit to trip by mistake, and further, the serious equipment damage is caused, and the economic loss is serious.
Description
Technical Field
The application relates to the technical field of steam turbine installation, and particularly discloses an axial displacement installation and debugging method.
Background
The steam turbine is also called as a steam turbine engine, and is a rotary steam power device.A high-temperature high-pressure steam passes through a fixed nozzle to become an accelerated airflow and then is sprayed onto blades, so that a rotor provided with blade rows rotates, and simultaneously, the rotor does work outwards. Steam turbines are the main equipment of modern thermal power plants, and are also used in metallurgical industry, chemical industry and ship power plants, and before the steam turbines are used, the installation of the front boxes of the steam turbines is also very important.
After all bodies and thermal equipment in the front box are installed and debugged, installing an upper cover of the front box and a side cover of the front box, hoisting the upper cover to the upper surface of a lower cover by using a special installation device when the upper cover is installed, fixing the upper cover, installing the side cover after the upper cover is installed, and enabling the upper cover to be installed on the lower cover, wherein a phenomenon occurs in the actual installation process, the axial displacement of a bearing in the front box of the steam turbine integrally deviates by about 0.5mm in the installation process, the deviation of each installation is uncertain, and if the deviation is ignored, the deviation leads to the deviation of a protection action constant value of 0.5mm, the protection misoperation or refusal action can be caused in the operation process of a unit, the misoperation can cause the unit to be tripped by mistake, the comprehensive loss is nearly 100 million and a unit non-stop index is obtained; if the actual axial displacement reaches the protection fixed value, and the fixed value deviation causes the protection rejection, the device is damaged significantly, and tens of millions of losses may be caused.
Disclosure of Invention
The invention aims to solve the problems that the traditional turbine front box causes axial displacement deviation in the process of installing an upper cover and a side cover, causes unit mis-tripping caused by protection misoperation or refusal action in the operation process of a unit, further causes great equipment damage and serious economic loss.
In order to achieve the above object, the present invention provides the following basic solutions:
an axial displacement installing and debugging method comprises the following steps:
s1: after determining the total thrust gap when the mounting device is mounted with the upper cover and positioning the bearing in the steam turbine, mounting the axial displacement probe in the front box of the steam turbine;
s2: installing an upper cover of a front box of the steam turbine, and connecting the periphery of the upper cover and the periphery of a lower cover through connecting bolts to enable the upper cover and the lower cover to be connected;
s3: in the process of installing the upper cover, the installation of each connecting bolt during the installation of the upper cover is debugged through the axial displacement probe;
s4: the upper cover and the lower cover of the steam turbine front box are integrally formed with connecting blocks, and the side cover of the steam turbine front box is installed through the connecting blocks by using fixing bolts;
s5: in the process of installing the side cover, the installation of each fixing bolt is debugged when the side cover is installed through the axial displacement probe.
The principle and the effect of the basic scheme are as follows:
1. compared with the prior art, the axial displacement probe arranged in the cylinder body of the front box can monitor the axial displacement change of the front box in the whole installation process of each bolt in the installation process of the upper cover, so that fine adjustment is performed during installation of each bolt, the axial displacement in the installation process of the upper cover is prevented from being too large, the unit is prevented from mistakenly tripping caused by protection misoperation or action rejection in the operation process of the unit, and further serious equipment damage is avoided.
2. Compared with the prior art, the axial displacement probe is arranged, so that the axial displacement change of the front box in the installation process of each bolt can be monitored in the installation process of the side cover, the installation and debugging are convenient, and the overlarge axial displacement of the front box of the steam turbine in the installation process of the side cover is reduced.
3. Compared with the prior art, the front box cover of the steam turbine mainly comprises 3 parts, namely a lower front box cover, an upper cover and a side end cover, the relative position of each screw hole is inevitably changed in the links of processing, transportation, overhauling, dismounting, lifting and the like, an error is generated with a design value, the error of a few millimeters is very little for the front box, but is fatal for axial displacement, and the method used in the invention is not dependent on the side wall of the front box, so that the actual position of an axial displacement bracket is prevented from being influenced when the upper front box cover and the side cover are installed, the axial displacement parameters are prevented from being deviated due to the installation of the front box cover, the potential safety hazard of a unit is eliminated, and the safe and stable operation of the unit is ensured.
Furthermore, the steam turbine front box is internally detachably connected with an axial displacement probe support on the lower box cover, the axial displacement probe support is provided with a plurality of axial displacement probes installed on the side wall of the steam turbine front box, and the axial displacement probes are symmetrically arranged. The axial displacement amount of the front box in the installation process can be monitored in real time through the symmetrically arranged axial displacement probes.
Furthermore, the upper cover and the lower cover of the steam turbine front box are integrally formed with connecting blocks, a plurality of upper cover and lower cover fastening threaded holes are formed in the connecting blocks, and a plurality of side cover fastening threaded holes used for being connected with the side cover are uniformly distributed in the circumferential direction of the end face of each connecting block. The upper cover and the lower cover can be connected through the arranged upper cover fastening threaded holes and the lower cover fastening threaded holes, and the side cover fastening threaded holes are used for connecting the side covers.
Further, in the step S2, in the process of installing the upper cover, the four axial displacement data changes are monitored in the whole fixing process by installing the connecting bolts around the upper cover until the connecting bolts are just fixed, and if the axial displacement data is influenced in the fastening process of a certain connecting bolt, the fastening of the connecting bolt is stopped and the connecting bolt is pushed out to the position where the axial displacement data is restored to the original data, so that the change of the axial displacement data is ensured within the range of 0.05 mm.
Further, if the axial displacement is influenced too much in the fastening process of one or more connecting bolts and cannot be corrected, the other connecting bolts are fastened first, and finally, the non-fastened connecting bolts are fastened, the fastening sequence is adjusted appropriately, and 4 axial displacement data changes are monitored in real time.
Further, if the connecting bolt has a large influence on the axial displacement, the force position of the upper cover and the lower cover fastening threaded hole and the connecting bolt needs to be determined, the upper cover is disassembled, the recorded position is ground, about 0.5mm is ground, the deformation of the lower cylinder wall caused by the force of the connecting bolt and the upper cover connecting point is reduced, the cylinder is reassembled and adjusted according to the method again, and the influence on the axial displacement after all the connecting bolts are fastened is within the range of 0.05 mm.
Further, in step S4, a sealant with a sufficient thickness is applied to the inner end surface of the side cover when the side cover is installed. Sealant is coated for sealing the front box,
further, the side cover is installed through the side cover fastening threaded hole by using the fixing bolt until the side cover is just fastened, the side cover is fastened one by one from the diagonal direction, the change of axial displacement data is closely concerned, if a certain fixing bolt is fastened, the fixing bolt is withdrawn, a sizing block of 0.2mm-0.5mm is padded in a combining surface, the thickness of the sizing block is adjusted according to actual conditions and then fastened until all the fixing bolts are fastened, and the axial displacement influence is within the range of 0.05mm after all the bolts are fastened.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.
Fig. 1 is a schematic diagram illustrating a mechanism of an axial displacement probe and a connecting block in an axial displacement installation and debugging method according to an embodiment of the present disclosure;
fig. 2 is a schematic structural diagram illustrating an axial displacement probe in an axial displacement installation and debugging method according to an embodiment of the present disclosure;
fig. 3 shows a schematic diagram of connection between an upper cover and a lower cover in an axial displacement installation and debugging method according to an embodiment of the present application.
Detailed Description
To further illustrate the technical means and effects of the present invention adopted to achieve the predetermined objects, the following detailed description of the embodiments, structures, features and effects according to the present invention will be made with reference to the accompanying drawings and preferred embodiments.
Reference numerals in the drawings of the specification include: the device comprises a mounting seat 1, a connecting block 2, an axial displacement support 3, a connecting screw 4, a machine base 5, a first probe 501, a second probe 502, a third probe 503, a fourth probe 504, an upper cover and lower cover fastening threaded hole 6, a side cover fastening threaded hole 7, a side cover 8, a fixing bolt, a lower cover 10 and an upper cover 11.
Examples are shown in fig. 1, 2 and 3:
an axial displacement mounting and debugging method comprises the following steps:
s1: after determining the total thrust gap when the mounting device is mounted with the upper cover and positioning the bearing in the steam turbine, mounting the axial displacement probe in the front box of the steam turbine;
s2: installing an upper cover of a front box of the steam turbine, and connecting the periphery of the upper cover and the periphery of a lower cover through connecting bolts to enable the upper cover and the lower cover to be connected;
s3: in the process of installing the upper cover, debugging the installation of each connecting bolt when the upper cover is installed through the axial displacement probe;
s4: the upper cover and the lower cover of the steam turbine front box are integrally formed with connecting blocks, and the side cover of the steam turbine front box is installed through the connecting blocks by using fixing bolts;
s5: and in the process of mounting the side cover, debugging is carried out on the mounting of each fixing bolt when the side cover is mounted through the axial displacement probe.
For S1, the front box of the steam turbine mainly comprises three parts: the method comprises the steps that before installation, a total thrust gap needs to be determined and a bearing needs to be positioned, preparation for installation of an upper cover 11 is made, then an axial displacement support 3 is installed on an installation base 1 of the lower cover 10, the axial displacement support 3 is installed inside the lower cover 10 through connecting screws 4 on two sides, the installation base 1 is fixed inside a front box and serves as a working element inside the front box, a base 5 is arranged on the axial displacement installation support, a plurality of axial displacement probes connected with the installation base 1 are arranged on the base 5 and respectively serve as a first probe 501, a second probe 502, a third probe 503 and a fourth probe 504, the first probe 501 and the second probe 502 are installed on the front side wall of the installation base 1 and face the direction of a generator, the third probe 503 and the fourth probe 504 are installed on the rear side wall of the installation base 1 and face the direction of the generator, axial displacement probes 503 and 504 can sense axial displacement generated in the installation process of the upper cover 11 and the upper cover 8, data are transmitted to monitoring equipment, and a host computer of the monitoring equipment selects a safety monitoring device 3500 series produced by a TSI system and is used for connecting the first probe 501, the second probe 502 and the fourth probe 502 and the third probe 504 and the fourth probe 502.
The end parts of the lower cover 10 and the upper cover 11 are respectively provided with a connecting block 2, the connecting blocks 2, the lower cover 10 and the upper cover 11 are integrally formed, and are part of the lower cover 10 and the upper cover 11, the upper cover 11 is installed in the process of the lower cover 10, the connecting blocks 2 are respectively provided with upper cover fastening threaded holes 6 and lower cover fastening threaded holes 6 which correspond to each other, the upper cover 11 and the lower cover 10 are convenient to install, and are connected by using connecting bolts, for S2, after the axial displacement probe is installed, the front box inner body and thermal elements are confirmed to be installed correctly, the upper cover 11 is installed, the front box inner body and the thermal elements are fastened to be just fixed by the connecting bolts around the upper cover 11, four axial displacement data changes are monitored in the whole process of fastening of each connecting bolt, if the axial displacement data are influenced in the fastening process of a certain connecting bolt, the fastening of the connecting bolt is stopped and the connecting bolt is pushed out to the axial displacement data recovery data position, the left side, the right side and the rear side connecting bolt can properly accelerate, the connecting bolt on the front side must be fastened, the fastening speed is slowed down, and the sequential matching of the connecting bolts is guaranteed, and the axial displacement data change range of 0.05mm is guaranteed.
If the axial displacement is influenced too much in the fastening process of one or more connecting bolts and cannot be corrected in the fastening process of the connecting bolts, fastening other connecting bolts firstly, finally fastening the connecting bolts which are not fastened, properly adjusting the fastening sequence and monitoring 4 axial displacement data changes in real time.
If the axial displacement is greatly influenced by the connecting bolts, the stress positions of the upper and lower cover fastening threaded holes 6 and the connecting bolts need to be determined, the upper cover is disassembled, the recorded positions are ground, about 0.5mm is ground off, so that the deformation of the lower cylinder wall caused by the stress of the connecting bolts and the upper cover connecting points is reduced, the cylinder wall is reassembled and adjusted according to the method again, and the axial displacement is influenced within the range of 0.05mm after all the connecting bolts are fastened.
To S3, after the upper cover installation is completed, the side covers can be connected, side cover fastening threaded holes 7 are evenly distributed in the connecting block 2 in the circumferential direction, the side covers are fastened through the side cover fastening threaded holes 7 and fixing bolts, sealant with enough thickness is required to be coated on the inner end faces of the side covers in the process of side cover installation, so that the inside of the front box can keep good sealing performance after the side covers are installed, and the installation method is as follows: the side cover is installed through the side cover fastening threaded hole 7 by using a fixing bolt until the side cover is fastened exactly, the side cover is fastened one by one from the diagonal direction, the change of axial displacement data is closely concerned, if the influence of fastening of a certain fixing bolt on the axial displacement is large, the fixing bolt is withdrawn, a sizing block of 0.2mm-0.5mm is filled in a combining surface, the thickness of the sizing block is adjusted according to the actual condition and then fastened until all the fixing bolts are fastened, and the influence of all the bolts on the axial displacement is within the range of 0.05mm after the fastening. Compared with the traditional installation method in the actual application process, the method can observe that the axial displacement of the front box is obviously reduced from the monitoring equipment, the installation process is relatively stable, the subsequent normal operation of the steam turbine is ensured, the protection misoperation or the action rejection during the unit operation process is avoided, the unit is tripped by mistake due to the misoperation, the comprehensive loss is nearly 100 thousands, and a unit non-stop index is reached; if the actual axial displacement reaches the protection fixed value, and the fixed value deviation causes protection rejection, great equipment damage is caused, and tens of millions of losses which can be caused are avoided.
Although the present invention has been described with reference to the preferred embodiments, it will be understood by those skilled in the art that various changes may be made and equivalents may be substituted for elements thereof without departing from the scope of the present invention.
Claims (8)
1. An axial displacement installation and debugging method is characterized in that: the method comprises the following steps:
s1: after determining the total thrust gap when the mounting device is mounted with the upper cover and positioning the bearing in the steam turbine, mounting the axial displacement probe in the front box of the steam turbine;
s2: installing an upper cover of a front box of the steam turbine, and connecting the periphery of the upper cover and the periphery of a lower cover through connecting bolts to enable the upper cover and the lower cover to be connected;
s3: in the process of installing the upper cover, debugging the installation of each connecting bolt when the upper cover is installed through the axial displacement probe;
s4: the upper cover and the lower cover of the steam turbine front box are integrally formed with connecting blocks, and the side cover of the steam turbine front box is installed through the connecting blocks by using fixing bolts;
s5: in the process of installing the side cover, the installation of each fixing bolt is debugged when the side cover is installed through the axial displacement probe.
2. The axial displacement installing and debugging method according to claim 1, wherein an axial displacement probe bracket detachably connected to a lower box cover is arranged in the steam turbine front box, a plurality of axial displacement probes installed on the side wall of the steam turbine front box are arranged on the axial displacement probe bracket, and the axial displacement probes are symmetrically arranged.
3. The axial displacement mounting and debugging method of claim 1, wherein a plurality of upper and lower cover fastening threaded holes are formed in each connecting block, and a plurality of side cover fastening threaded holes for connecting with the side cover are uniformly formed in the circumferential direction of the end surface of each connecting block.
4. The axial displacement installing and debugging method of claim 1, wherein in the step S2, in the process of installing the upper cover, the connecting bolts are installed around the upper cover until the upper cover is just fixed, four axial displacement data changes are monitored in the whole fixing process, if the axial displacement data are influenced in the fastening process of a certain connecting bolt, the fastening of the connecting bolt is stopped, and the connecting bolt is pushed out to the position where the axial displacement data are restored to the original data, so that the axial displacement data changes within the range of 0.05 mm.
5. The axial displacement mounting and debugging method of claim 4, wherein if the axial displacement is too much influenced in the fastening process of one or more connecting bolts and cannot be corrected, the other connecting bolts are fastened first, and finally the non-fastened connecting bolts are fastened, the fastening sequence is adjusted properly, and 4 axial displacement data changes are monitored in real time.
6. An axial displacement installing and debugging method according to claim 4 or 5, wherein if the axial displacement is greatly influenced by connecting bolts, the fastening threaded holes of the upper cover and the lower cover and the stress positions of the connecting bolts need to be confirmed, the upper cover is disassembled, the recorded positions are ground, about 0.5mm is ground away to reduce the deformation of the lower cylinder wall caused by the stress of the connecting points of the connecting bolts and the upper cover, and the axial displacement is regulated according to the method after the connecting bolts are fastened again to ensure that the axial displacement is influenced within the range of 0.05 mm.
7. The method as claimed in claim 3, wherein in step S4, a sealant is applied to the inner end surface of the side cover to a sufficient thickness.
8. The method of claim 7, wherein the side covers are fastened through the side cover fastening screw holes by using fixing bolts until the side covers are fastened exactly, the side covers are fastened one by one from the diagonal direction, the axial displacement data change is closely concerned, if a certain fixing bolt is fastened, the fixing bolt is withdrawn, a sizing block of 0.2mm-0.5mm is padded on the bonding surface, the thickness of the sizing block is adjusted according to actual conditions, and then the fastening is carried out until all the fixing bolts are fastened, so that the axial displacement influence is ensured to be within 0.05mm after all the bolts are fastened.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211137003.0A CN115302222B (en) | 2022-09-19 | 2022-09-19 | Axial displacement mounting and debugging method |
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| CN202211137003.0A CN115302222B (en) | 2022-09-19 | 2022-09-19 | Axial displacement mounting and debugging method |
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| CN115302222B CN115302222B (en) | 2023-11-21 |
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| CN115302222B (en) | 2023-11-21 |
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